漂亮的文件上传按钮CSS样式设计
作者:admin 时间:2021-8-9 10:17:40 浏览:文件上传按钮默认无样式，现在应该没有网页或UI设计人员会用默认的按钮了。其实我们完全可以自己设计一个文件上传按钮，使用CSS设计布局和排版样式，巧妙地运用jQuery加以配合，就能实现。
下图就显示了默认和自定义的文件上传按钮样式的巨大变化。
漂亮的文件上传按钮CSS样式设计
本文就介绍如何实现上图的文件上传按钮。
实例介绍
本实例的文件上传按钮需要用到jQuery，因此要引用jQuery库文件。
点击“选择文件”弹出对话框，选择文件后，文件名出现在输入框中。
完整HTML文件
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Css FIle Upload</title>
<style>
* {
margin: 0;
padding: 0;
font-family: 微软雅黑;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
}
body {
color: #fff;
padding: 55px 25px;
background-color: #e74c3c;
}
h1 {
font-weight: normal;
font-size: 40px;
font-weight: normal;
text-transform: uppercase;
}
h1 span {
font-size: 13px;
display: block;
padding-left: 4px;
}
p {
margin-top: 200px;
}
p a {
text-transform: uppercase;
text-decoration: none;
display: inline-block;
color: #fff;
padding: 5px 10px;
margin: 0 5px;
background-color: #b83729;
-moz-transition: all 0.2s ease-in;
-o-transition: all 0.2s ease-in;
-webkit-transition: all 0.2s ease-in;
transition: all 0.2s ease-in;
}
p a:hover {
background-color: #ab3326;
}
.custom-file-upload-hidden {
display: none;
visibility: hidden;
position: absolute;
left: -9999px;
}
.custom-file-upload {
display: block;
width: auto;
font-size: 16px;
margin-top: 30px;
}
.custom-file-upload label {
display: block;
margin-bottom: 5px;
}
.file-upload-wrapper {
position: relative;
margin-bottom: 5px;
}
.file-upload-input {
width: 300px;
color: #fff;
font-size: 16px;
padding: 11px 17px;
border: none;
background-color: #c0392b;
-moz-transition: all 0.2s ease-in;
-o-transition: all 0.2s ease-in;
-webkit-transition: all 0.2s ease-in;
transition: all 0.2s ease-in;
float: left;
/* IE 9 Fix */
}
.file-upload-input:hover, .file-upload-input:focus {
background-color: #ab3326;
outline: none;
}
.file-upload-button {
cursor: pointer;
display: inline-block;
color: #fff;
font-size: 16px;
text-transform: uppercase;
padding: 11px 20px;
border: none;
margin-left: -1px;
background-color: #962d22;
float: left;
/* IE 9 Fix */
-moz-transition: all 0.2s ease-in;
-o-transition: all 0.2s ease-in;
-webkit-transition: all 0.2s ease-in;
transition: all 0.2s ease-in;
}
.file-upload-button:hover {
background-color: #6d2018;
}
</style>
</head>
<body translate="no" >
<h1>文件上传</h1>
<div class="custom-file-upload">
<!--<label for="file">File: </label>-->
<input type="file" id="file" name="myfiles[]" multiple />
</div>
<script src='jquery-3.2.1.min.js'></script>
<script id="rendered-js" >
//Reference:
//https://www.onextrapixel.com/2012/12/10/how-to-create-a-custom-file-input-with-jquery-css3-and-php/
;(function ($) {
// Browser supports HTML5 multiple file?
var multipleSupport = typeof $('<input/>')[0].multiple !== 'undefined',
isIE = /msie/i.test(navigator.userAgent);
$.fn.customFile = function () {
return this.each(function () {
var $file = $(this).addClass('custom-file-upload-hidden'), // the original file input
$wrap = $('<div class="file-upload-wrapper">'),
$input = $('<input type="text" class="file-upload-input" />'),
// Button that will be used in non-IE browsers
$button = $('<button type="button" class="file-upload-button">选择文件</button>'),
// Hack for IE
$label = $('<label class="file-upload-button" for="' + $file[0].id + '">选择文件</label>');
// Hide by shifting to the left so we
// can still trigger events
$file.css({
position: 'absolute',
left: '-9999px' });
$wrap.insertAfter($file).
append($file, $input, isIE ? $label : $button);
// Prevent focus
$file.attr('tabIndex', -1);
$button.attr('tabIndex', -1);
$button.click(function () {
$file.focus().click(); // Open dialog
});
$file.change(function () {
var files = [],fileArr,filename;
// If multiple is supported then extract
// all filenames from the file array
if (multipleSupport) {
fileArr = $file[0].files;
for (var i = 0, len = fileArr.length; i < len; i++) {
files.push(fileArr[i].name);
}
filename = files.join(', ');
// If not supported then just take the value
// and remove the path to just show the filename
} else {
filename = $file.val().split('\\').pop();
}
$input.val(filename) // Set the value
.attr('title', filename) // Show filename in title tootlip
.focus(); // Regain focus
});
$input.on({
blur: function () {$file.trigger('blur');},
keydown: function (e) {
if (e.which === 13) {// Enter
if (!isIE) {$file.trigger('click');}
} else if (e.which === 8 || e.which === 46) {// Backspace & Del
// On some browsers the value is read-only
// with this trick we remove the old input and add
// a clean clone with all the original events attached
$file.replaceWith($file = $file.clone(true));
$file.trigger('change');
$input.val('');
} else if (e.which === 9) {// TAB
return;
} else {// All other keys
return false;
}
} });
});
};
// Old browser fallback
if (!multipleSupport) {
$(document).on('change', 'input.customfile', function () {
var $this = $(this),
// Create a unique ID so we
// can attach the label to the input
uniqId = 'customfile_' + new Date().getTime(),
$wrap = $this.parent(),
// Filter empty input
$inputs = $wrap.siblings().find('.file-upload-input').
filter(function () {return !this.value;}),
$file = $('<input type="file" id="' + uniqId + '" name="' + $this.attr('name') + '"/>');
// 1ms timeout so it runs after all other events
// that modify the value have triggered
setTimeout(function () {
// Add a new input
if ($this.val()) {
// Check for empty fields to prevent
// creating new inputs when changing files
if (!$inputs.length) {
$wrap.after($file);
$file.customFile();
}
// Remove and reorganize inputs
} else {
$inputs.parent().remove();
// Move the input so it's always last on the list
$wrap.appendTo($wrap.parent());
$wrap.find('input').focus();
}
}, 1);
});
}
})(jQuery);
$('input[type=file]').customFile();
//# sourceURL=pen.js
</script>
</body>
</html>
代码解释
CSS的transition属性可设置鼠标移到按钮上时，按钮颜色动画变化效果。
CSS的background-color属性可设置按钮颜色。
HTML代码需要引用jQuery库文件，你可以引用百度等第三方提供的公共库文件。
<script src='jquery-3.2.1.min.js'></script>
代码已兼容各主流浏览器，包括IE。
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